Improvement in machines for sawing veneers



F. H. PLUMMER.

lmpr0vem ent in Machines-for Sawing Veneers.

Patented Sep. 10, 1872.

M. PHWU'LITHOGIMF/IIC 027-. K (USEORNEL PROCESSJ A ()FFIG FRANK H.PLUMMER, OF PLYMOUTH, NEWILAMPSHIRE.

IMPROVEMENT IN MACHINES FOR SAWING VENEERS.

Specification forming part of Letters Patent No. 131,225, datedSeptember 10, 1872.

Specification describing certain Improvements in Machines for SawingCylindrical Sheets from Logs, &c., invented by FRANK H. PLUMMER, ofPlymouth, in the county of Grafton and State of New Hampshire.

Nature and Objects of the Invention.

My invention consists in certain novel coinbinations and arrangements ofparts which have for their object to greatly facilitate the sawing ofcontinuous sheets of wood from a log, to be used in the manufacture ofboxes, carriage-bodies, 850., as will be fully set forth hereafter.

Description of the Drawing.

Figure l is a top view of my improved machine. Fig. 2 is an elevationtaken from the left-hand side of Fig. 1. Fig. 3 is a vertical GeneralDescription.

The machine represented in the accompanyin g drawing operates to cut orsaw a continuous sheet of wood from a log by the action of anendless-band saw, the log being continually fed up to the saw androtated at the same time by proper mechanism. The saw is strained aroundtwo horizontal flanged disks, and the log-carriages (one upon each side)are arranged upon the frame in the best position to present the logs tothe operation of the saw upon their circumference.

A represents the frame of the machine, supported at suitable height fromthe floor upon the standards. B B are the log-carriages traveling uponthe frame. 0 is the bearin g for the vertical shaft E, upon which thesaw-disk D turns. The other disk, D, is driven by a belt from thedriving-shaft E, to which motion is given by a belt from its maindriving-shaft; this shaft, and also the one to which the disk D issecured, being provided with cone-pulleys F F to regulate the feed ofthe logs. G

is a bevel-gear secured upon the end of the shaft E. It turns the shaftI through the medium of the bevel-gear H, and gives a continuous rotarymotion to it. This motion is transmitted to the logs through the worms JJ, feathered to the shaft I and sliding upon it, and the worm-wheels K Kon the log-carriages. L L are weights attached to the end of cords N N,secured to the carriages B, one to each side of the carriages. Thesefour cords pass over the grooved pulleys M M and act to draw thecarriages forward and keep the logs in contact with the saw. 0 O areadjustable slides that support the centers upon which the logs P Protate. It R are two pressure-rollers, one in front of each log. Theyare held in bearings immediately overv the saw, and adjusted by means ofthe screws Q Q. (See Fig. 5.) They operate to govern the depth of thecut of the saw, and, consequently, the thickness of the sheet produced.The logs are held by the cords and weights always in contact with therollers, and the relation of the circumference of the log with the planeof movement of the saw-teeth is controlled by the adjustment of theroller more or less back of the saw, the thickness of the sheet beinggreater as the roller is moved further from the line of the movement ofthe saw. This is illustrated in the detail view, Fig. 5. U U U U aregrooved rollers held in bearings on the frame beneath the saw, which actas supports for the saw and as guides to keep it in a true plane ofmovement. The means for straining the saw and keeping it at thepropertension consists of the bolt and nut V, the head of the bolt beingsecured to the journal-box of the shaft of the disk D, and the endprojecting through the bearing 0, and fitted with a nut, as shown inFig. 2.

The device shown in detail in Fig. 6 acts to guide the saw and keep itstraight in the out. It is strained between the frames, and lies betweenthe log and the board being cut, immediately under the saw, and isformed of a rod,

, X, with a series of pins projecting from it, with grooves in theirends to guide the lower edge of the saw. These parts act to feed and present the log automatically to the saw, so that the operation of the sawupon the circumference of the log is continuous until it is cut up intoa sheet or sheets of the required thickness.

and its vibrating support with the temperscrew Q and spring T, whenarranged with relation t0 the band-saw S and 10g R, in the mannersubstantially as described.

FRANK H. PLUMMER.

Witnesses:

E. J. DURANT,

G. E. DURAN'I.

